Lamp holder



FIG. 1 is a front perspective view of a lamp holder showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a front perspective view showing the lamp holder with a lampshade shown in dotted line for illustrative purposes and forming no part of the claimed design. 

The ornamental design for a lamp holder, as shown and described. 